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Journal articles on the topic 'Minimal Power Operation'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 September 2023

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1

Benthem, Johan Van. "Minimal predicates, fixed-points, and definability." Journal of Symbolic Logic 70, no. 3 (2005): 696–712. http://dx.doi.org/10.2178/jsl/1122038910.

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AbstractMinimal predicates P satisfying a given first-order description ϕ(P) occur widely in mathematical logic and computer science. We give an explicit first-order syntax for special first-order ‘PIA conditions’ ϕ(P) which guarantees unique existence of such minimal predicates. Our main technical result is a preservation theorem showing PIA-conditions to be expressively complete for all those first-order formulas that are preserved under a natural model-theoretic operation of ‘predicate intersection’. Next, we show how iterated predicate minimization on PIA-conditions yields a language MIN(F

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2

Chlaihawi, Amer A., Ameen Al-Modaffer, and Hur Jedi. "Minimal switching of multiple input multilevel output DC-DC converter." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 2 (2021): 968. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp968-974.

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This paper proposes a minimal switching multiple input multilevel output (MS-MIMLO) DC-DC converter. Minimizing the cost of operation is an utmost priority of any electric circuit design. Thus, reduction number of switches that control and manage the operation of feeding power into the MIMLO DC-DC convertors is presented. The proposed MS-MIMLO DC-DC converter exerts many advantages, include high voltage transfer ratio with a small size inductor, reduced power losses and low voltage stress across the semiconductor devices. Beside the highly conversion ratio and efficiency, the characteristics o

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3

Saifudin, Ilham. "Power Domination Number On Shackle Operation with Points as Lingkage." JTAM | Jurnal Teori dan Aplikasi Matematika 4, no. 1 (2020): 1. http://dx.doi.org/10.31764/jtam.v4i1.1579.

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The Power dominating set is a minimum point of determination in a graph that can dominate the connected dots around it, with a minimum domination point. The smallest cardinality of a power dominating set is called a power domination number with the notation . The purpose of this study is to determine the Shackle operations graph value from several special graphs with a point as a link. The result operation graphs are: Shackle operation graph from Path graph , Shackle operation graph from Sikel graph , Shackle operation graph from Star graph . The method used in this paper is axiomatic deductiv

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Guennouni, Nasr, Ahmed Chebak, and Nadia Machkour. "Optimal Dual Active Bridge DC-DC Converter Operation with Minimal Reactive Power for Battery Electric Vehicles Using Model Predictive Control." Electronics 11, no. 10 (2022): 1621. http://dx.doi.org/10.3390/electronics11101621.

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The dual active bridge DC-DC converter is a promising power converter used in several applications. Much research has been focusing on the study of such a converter from different angles. In this paper, an optimal design of the DAB converter is proposed to provide minimal reactive power in addition to reduced weight and size for the converter magnetic components in order to assure the DC-DC conversion stage of battery electric vehicles’ powertrains. Two modes of operation are considered in order to fulfill such a requirement and minimize reactive power of the converter (circulating current/con

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Venkataramanan, G., B. Milkovska, V. Gerez, and H. Nehrir. "Variable Speed Operation of Permanent Magnet Alternator Wind Turbines Using a Single Switch Power Converter." Journal of Solar Energy Engineering 118, no. 4 (1996): 235–38. http://dx.doi.org/10.1115/1.2871784.

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Advantages of operating wind turbine generators at variable speed are well known. Various approaches have been proposed to extract maximum power from the turbines by operating them at the optimum tip-speed ratio. Often, they feature a three-phase controlled rectifier d-c link followed by a three-phase inverter type of power converter topology to deliver constant frequency a-c output power from a variable speed generator coupled to the turbine. However, in stand-alone power supply applications for remote sites, where the power level is a few kW or less, this approach is economically unjustifiab

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Mahmudh, Riyadzh, Mst Sharmin Kader, and Han Xioaqing. "Improved Extreme Learning Machine Power Load Forecasting Based on Firefly Optimization Algorithms." International Journal of Advanced Engineering Research and Science 10, no. 5 (2023): 086–99. http://dx.doi.org/10.22161/ijaers.105.13.

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Power load forecasting is a crucial safeguard for the reliable, efficient, and safe operation of the power system, which is connected to the smooth operation of society at all levels. In practical applications, extreme learning machines have advantages like quick learning rates and minimal training error, but they have poor stability and generalization skills. The learning of the sample lacks relevance because the weight matrix between the hidden layer and the output layer in the limit learning is chosen at random. Because of its simple algorithm flow and strong global optimization capabilitie

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Ykuntam, Yamini Devi, Bujjibabu Penumutchi, Bala Srinivas Peteti, and Satyanarayana Vella. "Performance Evaluation of Approximate Adders: Case Study." International Journal of Engineering and Advanced Technology 12, no. 1 (2022): 68–75. http://dx.doi.org/10.35940/ijeat.a3836.1012122.

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A computing device designed to carry out a variety of arithmetic computations. The adder circuit, whose operation must be quick with a small area of occupancy, performs the addition, which is a necessary operation in many other mathematical operations including subtraction, multiplication, and division. There is a mandate for an adder circuit with minimal power consumption, minimal delay, and minimal size in various real-time applications such as processing of signals, pictures & video, VLSI data pathways, processors, neural networks, and many more. There is a new class of adders called ap

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8

Sreejith, K., Bharadwaj Amrutur, and Ashok Balivada. "A Workload Based Lookup Table for Minimal Power Operation Under Supply and Body Bias Control." Journal of Low Power Electronics 5, no. 2 (2009): 173–84. http://dx.doi.org/10.1166/jolpe.2009.1018.

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9

Banach, Henryk. "A Measurement Method of Determining the Power Supply Parameters for the Optimal Operation of a Synchronous Motor." Measurement Science Review 22, no. 1 (2022): 11–16. http://dx.doi.org/10.2478/msr-2022-0002.

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Abstract The article presents a measurement method for determining the power supply parameters for the optimal operation of a synchronous motor, i.e. operation with minimal losses in the entire load range. The measurement strategy is based on the search for the minimum sum of the power supplied to the excitation circuit and the stator circuit for the assumed load torque values. The process of searching for the minimum sum of power can be significantly shortened and simplified by using a network parameter meter. The research confirmed the usefulness of the proposed method for determining the op

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10

Chen, Hong Hui, Ji Chun Liu, Yan Zhao, et al. "Research on Charge and Discharge Strategy for Centralized EVs Charging Stations." Advanced Materials Research 1008-1009 (August 2014): 376–80. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.376.

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High penetration of electric vehicles has brought huge impact on the safe and stable operation of power grid. How to effectively improve the comprehensive utilization rate of electric vehicle charging and discharging has become the most important problem for the grid operation. In this paper, we establish the centralized station model which takes the minimal real power loss as its objective and bring variance optimization function. Using IEEE 30-bus system as simulation system, this paper uses genetic algorithm to find the best solution of the above model. The result shows that reasonable arra

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Hafizov, C. A., R. N. Hafizov, A. A. Nurmiev, and F. H. Khaliullin. "Minimum required power capacity of tractors depending on grain cultivation methods." IOP Conference Series: Earth and Environmental Science 996, no. 1 (2022): 012031. http://dx.doi.org/10.1088/1755-1315/996/1/012031.

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Abstract The paper identifies aggregate power capacity produced by tractor engines on a farm engaged in spring grain cultivation alternating methods for primary and secondary tillage by years and crop rotations. The required power capacity is calculated based on an energy tractor-implement model in primary, secondary tillage and sowing operations. Power capacity is enhanced with due account of measurements and quantity of equipment to have an impact on spring grain harvest. The minimum power capacity is required for no till methods (0.93-1.42 kW/ha). The maximum power capacity is required for

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Frolov, Viacheslav, Olga Prikhodko, and Sergey Slipchenko. "Calculation of the energy-efficient cutting modes in turning operation." Energy Systems 5, no. 1 (2020): 228–35. http://dx.doi.org/10.34031/es.2020.1.026.

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The mathematical model has been developed for cutting modes optimization for the operation of lathe machines with the discrete change of spindle rotational speed and feed. The optimality criterion for this model is the minimal cutting power spread on the loading diagram. The use of this criterion allows to increase the operational efficiency of an induction motor by means of more balanced loading during the manufacturing operation. The optimization problem is solved by using the genetic algorithm.

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Lee, Daeil, Seoryong Koo, Inseok Jang, and Jonghyun Kim. "Comparison of Deep Reinforcement Learning and PID Controllers for Automatic Cold Shutdown Operation." Energies 15, no. 8 (2022): 2834. http://dx.doi.org/10.3390/en15082834.

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Many industries apply traditional controllers to automate manual control. In recent years, artificial intelligence controllers applied with deep-learning techniques have been suggested as advanced controllers that can achieve goals from many industrial domains, such as humans. Deep reinforcement learning (DRL) is a powerful method for these controllers to learn how to achieve their specific operational goals. As DRL controllers learn through sampling from a target system, they can overcome the limitations of traditional controllers, such as proportional-integral-derivative (PID) controllers. I

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Zarudskiy, Georgy K. "Minimization of Technical Active Power Losses in Extra-High Voltage Overhead Power Lines Taking the Corona Effect into Account." Elektrichestvo, no. 3 (2022): 5–21. http://dx.doi.org/10.24160/0013-5380-2022-3-5-21.

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A technique has been developed to minimize active power losses that takes into account the corona effect on extra-high voltage overhead power transmission lines in normal modes of their operation. The corona effect is modeled by a specific conductivity, which is a nonlinear function of the voltage level. The equivalent conductivity value is corrected for the actual weather conditions iteratively by changing the r.m.s. voltage value. A universal expression for estimating the effect of operating parameters on the change of voltage along the line length and a graphic illustration of this effect a

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15

Lamichhane, Anil, Lidan Zhou, Gang Yao, and Muhammad Luqman. "Modeling, Control and Power Management of Six-Phase PMSM Based Shipboard MVDC Distribution System." Energies 13, no. 16 (2020): 4229. http://dx.doi.org/10.3390/en13164229.

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In the modern shipboard power system, there is a growing concern about reduced fuel economy, efficiency improvement, and minimized emission in recent years. Besides, considering the islanded nature of the shipboard power system, ensuring the system reliability at both generation and load side is crucial. In this context, a hybrid medium voltage DC (MVDC) distribution system concept with diesel engine, PV system, and battery energy storage system (BESS) as the generators for the shipboard power system is proposed. Variable speed operation of a diesel engine is considered for the benefit of mini

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Kim, Seonmyeong, Changhwan Jang, and Jinho Kim. "Design and Experiment of Discharge Control Methods for Three-Stage Coil Gun Experiments." Applied Sciences 13, no. 3 (2023): 1779. http://dx.doi.org/10.3390/app13031779.

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The aim of this study was to design operation methods for three-stage coil gun experiments and to fabricate and compare prototypes of control systems using these methods. Two methods are proposed: (1) recognizing the position of a projectile using a photointerrupter and (2) operating a control circuit to supply power to a silicon-controlled rectifier when the projectile reaches an intended position by registering the delay time between coil gun operations. The distance between the projectile and the solenoid coil during a coil gun operation is a key design factor. For the multi-stage coil gun

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17

Khlebnikov, Vladimir, Nicholay Tsygulev, Kirill Smagin, Razmik Galstyan, and Dmitriy Zhirovov. "Control of Digitalized Distribution Electric Network According to the Criterion of Minimum Loss of Electric Power Transmission." Известия высших учебных заведений. Электромеханика 64, no. 2 (2021): 71–77. http://dx.doi.org/10.17213/0136-3360-2021-2-71-77.

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At present, the world energy industry is focused on creating intelligent distribution electric networks with management on the energy Internet platform. To solve this problem, a model circuit of an intelligent distribution radial electric network was developed, for controlling parameters in normal and post-accident modes of which, it is proposed to use regulators of transformation coefficients of network transformers and fastacting compensating devices for smooth control of reactive load power. Mathematical model of proposed network and target function are formed, minimization of which ensures

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18

Sumanth Kumar, Kamineni, and John Reuben. "Minimal Buffer Insertion Based Low Power Clock Tree Synthesis for 3D Integrated Circuits." Journal of Circuits, Systems and Computers 25, no. 11 (2016): 1650142. http://dx.doi.org/10.1142/s0218126616501425.

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Three-Dimensional (3D) Integrated Circuits (ICs) offers integrating capabilities of ‘More than Moore’ while overcoming CMOS scaling limitations, providing the advantages of low power, high performance and reduced costs. The design of the Clock Distribution Network (CDN) for a 3D IC has to be done meticulously to guarantee reliable operation. In the design of the CDN, clock buffers are crucial units that affect the clock skew, slew and power dissipated by the clock tree. In this paper, we propose a two-stage buffering technique that inserts clock buffers for slew control and skew minimization.

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19

Ortiz Silva, Neil A., Jairo Blanco Solano, Johann F. Petit Suárez, Gabriel Ordóñez Plata, and Víctor Barrera Núñez. "A New Method to Characterize Power Quality Disturbances Resulting from Expulsion and Current-Limiting Fuse Operation." DYNA 82, no. 192 (2015): 177–84. http://dx.doi.org/10.15446/dyna.v82n192.48616.

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<p>This paper presents a new method for the characterization and diagnosis of electrical disturbances caused by fuses operation in the electrical distribution systems. A set of descriptors is proposed in order to quantify the typical features of the distortions caused by operation of expulsion and current limiting fuses. A multivariate statistical analysis is performed to select the descriptors with the best profiles qualifiers and the optimal decision thresholds are selected through of machine learning algorithms. Voltage and current signals of the fuses operation are obtained from the

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20

Pareek, Parikshit, and Hung D. Nguyen. "State-Aware Stochastic Optimal Power Flow." Sustainability 13, no. 14 (2021): 7577. http://dx.doi.org/10.3390/su13147577.

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The increase in distributed generation (DG) and variable load mandates system operators to perform decision-making considering uncertainties. This paper introduces a novel state-aware stochastic optimal power flow (SA-SOPF) problem formulation. The proposed SA-SOPF has objective to find a day-ahead base-solution that minimizes the generation cost and expectation of deviations in generation and node voltage set-points during real-time operation. We formulate SA-SOPF for a given affine policy and employ Gaussian process learning to obtain a distributionally robust (DR) affine policy for generati

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21

Ouyang, Chunming. "A Minimal Water power Loss Model Based on Annealing Genetic Algorithm in Optimal Operation of Cascade Reservoirs." Journal of Physics: Conference Series 1176 (March 2019): 052030. http://dx.doi.org/10.1088/1742-6596/1176/5/052030.

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22

Lekshmana, Ramesh, Sanjeevikumar Padmanaban, Sagar Mahajan, Vigna Ramachandaramurthy, and Jens Bo Holm-Nielsen. "Meter Placement in Power System Network—A Comprehensive Review, Analysis and Methodology." Electronics 7, no. 11 (2018): 329. http://dx.doi.org/10.3390/electronics7110329.

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The blackout in North India due to the failure of the central grid has led to the need for intelligent power system state estimation, where optimal location is necessary to understand. State estimation meter placement plays a major role in the smart operation of a modern distributed power system. A literature review of the different algorithms incorporated for the determination of minimal number of meters required for the measurement of real time measurements is presented for the power system and distribution system state estimation, including smart meter location.

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23

Victorovych Sagin, Sergii, Oleksiy Andriiovych Kuropyatnyk, Yurii Victorovych Zablotskyi, and Oleksandr Victorovich Gaichenia. "Supplying of Marine Diesel Engine Ecological Parameters." Naše more 69, no. 1 (2022): 53–61. http://dx.doi.org/10.17818/nm/2022/1.7.

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The by-pass system of exhaust gas for the engine 6L20 Wartsila has been observed. The requirements of Annex VI MARPOL towards nitrogen oxide concentration in ship engine exhaust gases have been provided. The purpose of research was the determination of diesel 6L20 Wartsila by-pass exhaust gases optimum volume – at this the nitrogen oxide minimal concentration in exhaust gases is assured, the minimal increase (comparing with operation mode without by-pass) – specific effective fuel consumption, supporting of necessary thermal factor diapason of engine cylinders. The research was performed for t

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Lee, Hyeonseok, Van-Son Trinh, and Jung-Dong Park. "A 90 GHz Broadband Balanced 8-Way Power Amplifier for High Precision FMCW Radar Sensors in 65-nm CMOS." Sensors 22, no. 9 (2022): 3114. http://dx.doi.org/10.3390/s22093114.

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We present a W-band 8-way wideband power amplifier (PA) for a high precision frequency modulated continuous wave (FMCW) radar in 65-nm CMOS technology. To achieve a broadband operation with an improved output power for a high range resolution and high distance coverage of FMCW radar sensors, a balanced architecture is employed with the Lange coupler which naturally combines the output powers from two 4-way push-pull PAs. By utilizing a transformer-based push-pull structure with a cross-coupled capacitive neutralization technique, the gate-drain capacitance of the 4-way PA is compensated for th

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Zhu, Feng, Jing-Qi Fu, Bin Zou, and Wen-Rong Si. "A Simulation Method Based on the Candidate Operation Strategies for the Combined Cooling, Heat, and Power (CCHP) System." Mathematical Problems in Engineering 2021 (February 28, 2021): 1–13. http://dx.doi.org/10.1155/2021/8897267.

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With the change of the distributed Combined cooling, heat, and power (CCHP) system operation environment, such as the operation under the power market, CCHP needs to adopt the operation strategy based on cost minimization instead of the traditional following thermal load strategy (FTL). However, the current CCHP system simulation adopts FTL or FEL or a combination of the two; whether these strategies have the least cost has not been confirmed. In this paper, all kinds of operation strategies of the CCHP with two cooling methods are investigated according to the KKT conditions (Karush–Kuhn–Tuck

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Lyashenko, Yu, and A. Prudiy. "RESEARCH INTO THE IMPACT OF ROAD POWER ENERGY SYSTEM MECHANICAL CONVERTER LINKS MOTION ON GENERATOR OPERATION." Bulletin of the South Ural State University series "Power Engineering" 21, no. 3 (2021): 41–48. http://dx.doi.org/10.14529/power210305.

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Currently, alternative energy sources are used to economize. They provide autonomous power supply for the electrical receivers. One of the solutions in the field of alternative generation for lighting and power supply to low-power electrical receivers is to use road power energy systems. It is integrated as speed breakers and has an electromechanical generator converting a car speed energy into electrical energy. The paper considers the developed road power energy system with a rocker rod gear used to convert the forward movement to rota-tional movement. The study concentrates on the influence

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Kondratyev, S. I., and A. I. Epikhin. "Using telematics data to support effective solutions for tracking and monitoring the power system condition of unmanned vessels." Journal of Physics: Conference Series 2061, no. 1 (2021): 012089. http://dx.doi.org/10.1088/1742-6596/2061/1/012089.

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Abstract The paper studies the prospects of using telematics data to support effective solutions for tracking and monitoring the condition of the power supply system (PSS) components of unmanned vessels (UV) through the determination of positioning and, accordingly, operating time of PSS components. The paper attempts to describe one of the modules of the proposed integrated telematics system for UV monitoring, diagnostics and control. For practical implementation of telematics for unmanned merchant vessels, an algorithm has been developed to diagnose the technical condition of PSS components

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Blanco-Barrero, Juan Manuel. "Operation of hydroelectric plants without storage volume due to optimization of the turbine flow." Renewable Energy, Biomass & Sustainability 3, no. 2 (2022): 36–45. http://dx.doi.org/10.56845/rebs.v3i2.51.

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Hydroelectric power plants in diversion scheme systems utilize the water flowing through the river, since they present the necessary facilities and infrastructures to channel and harness the water, without having in their initial conception any storage systems. This type of power stations are designed and automated to operate between certain limits of water head, working with “constant head”, using the heads available at any moment. The operating limits are determined by the “nominal flow” for which the power plant has been designed and the “minimal technical flow” which corresponds to the min

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Żółtowski, Piotr, and Witold Bużantowicz. "Self-Balancing Power Amplifier with a Minimal DC Offset for Launcher Automation Control Circuits of a Surface-to-Air Missile System." Applied Sciences 12, no. 7 (2022): 3532. http://dx.doi.org/10.3390/app12073532.

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This paper discusses the design of a new self-balancing amplifier of an AC component power characterized by a minimal output DC offset. The design of the amplifier is based on semiconductor technology and intended for application in low-frequency analog signal processing paths, particularly in surface-to-air missile system launcher automation circuits. The proposed solution has several design and technical-implementation advantages, whereas the primary novelty compared to the commonly used ones is the ability for self-generating a near-zero DC component value of output signal. The design featu

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Cheng, Hsien-Chie, Yan-Cheng Liu, Hsin-Han Lin, Shian-Chiau Chiou, Chih-Ming Tzeng, and Tao-Chih Chang. "Development and Performance Evaluation of Integrated Hybrid Power Module for Three-Phase Servo Motor Applications." Micromachines 14, no. 7 (2023): 1356. http://dx.doi.org/10.3390/mi14071356.

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This study aims to develop a 30 kHz/12 kW silicon carbide (SiC)/Si integrated hybrid power module (iHPM) for variable frequency drive applications, particularly industrial servo motor control, and, additionally, to theoretically and experimentally assess its dynamic characteristics and efficiency during operation. This iHPM integrates a brake circuit, a three-phase Si rectifier, and a three-phase SiC inverter within a single package to achieve a minimal current path. A space-vector pulse width modulation (SVPWM) scheme is used to control the inverter power switches. In order to reduce parasiti

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D, Danalakshmi, Kannan S, and Gnanadass R. "Generator reactive power pricing for practical utility system using power flow tracing method." International Journal of Engineering & Technology 7, no. 1.8 (2018): 20. http://dx.doi.org/10.14419/ijet.v7i1.8.9444.

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The shift from regulated to restructured power system results in an increased competition among the electricity market. In restructured power system, the separation of transmission services from generation and distribution makes it necessary to find the contribution of power from individual generator to individual load. The power flow tracing method is used to obtain the generator power output to a particular load. The reactive power has to be maintained in order to sustain the voltage level throughout the system for reliable and secure operation. Hence the reactive power cost allocation has b

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Yang, Yuanchao, and Zichen Gao. "Power Management Problem for Civil Aircraft under More Electric Environment." International Journal of Aerospace Engineering 2020 (January 24, 2020): 1–19. http://dx.doi.org/10.1155/2020/8474375.

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The civil aviation industry is moving toward the more electric aircraft (MEA) which is to use electrical power to meet the load demands on multiple aircraft subsystems which are conventionally driven by other power resources. Thus, there will be introduced a large amount of new electrical power demands which are safety-critical for aircraft’s flight and this may lead the challenge for a reliable and efficient power management problem (PMP): the balance between the aircraft power supply and demands while minimizing the operation costs. To cope with the PMP for civil aircraft under more electric

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Seok, Mingoo, Scott Hanson, David Blaauw, and Dennis Sylvester. "Sleep Mode Analysis and Optimization With Minimal-Sized Power Gating Switch for Ultra-Low ${V}_{\rm dd}$ Operation." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 20, no. 4 (2012): 605–15. http://dx.doi.org/10.1109/tvlsi.2011.2109069.

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Bitney, V. D., N. N. Smotrov, A. A. Timofeev, and A. V. Okhlopkov. "Effect of Reactive Power Consumption Mode on Technical Condition of T3FP-110-2MU3 Turbogenerator." Vestnik IGEU, no. 3 (June 30, 2023): 34–42. http://dx.doi.org/10.17588/2072-2672.2023.3.034-042.

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The necessity of turbogenerators operation in the reactive power consumption mode is determined by the shortage of compensating devices in the network. Recently, accidents associated with generators long-term operation at low levels of excitation have become more frequent, which is a prerequisite for the consumption of reactive power by the generator. The purpose of this research is to assess the effect of the reactive power consumption mode on the technical condition of the T3FP-110-2MU3 turbogenerator. The source of information about the technical condition of the turbogenerator is the data

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Vlatskaya, Lyudmila, and Natalya Semenova. "Stochastic algorithms comparative analysis of power selection for compensating device in electric network nodes." Energy Systems 5, no. 1 (2020): 94–101. http://dx.doi.org/10.34031/es.2020.1.011.

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The article has analyzed the problem of compensating the device`s optimal power selection for electric network nodes with respect to the criterion of minimal losses of active power. The solution to this problem is carried out by using stochastic methods such as the Monte Carlo method and genetic algorithm. The paper presents: a mathematical model of an optimization problem, developed algorithms, and flow diagrams of stochastic methods. It has presented the results of comparative analysis of programs operation the realization of which is based on the stochastic methods and method of full enumer

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Wang, L. B., C. X. Mao, D. Wang, J. M. Lu, J. F. Zhang, and X. Chen. "Extended Unbalanced Operation of Induction Motor Driven System Based on a Single-Phase Electronic Power Transformer." Journal of Circuits, Systems and Computers 24, no. 04 (2015): 1550045. http://dx.doi.org/10.1142/s0218126615500450.

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A new control strategy to extend the unbalanced operation of the induction motor driven system based on a single-phase electronic power transformer (EPT) is proposed in this paper. This new motor driven system avoids the traditional input power transformer and only single-phase power network is needed. It has a modular structure and consists of series H-bridges rectifier, output-parallel dual active bridge converters and a three-phase voltage source inverter. In the input stage, a new control strategy is proposed to balance the dc voltages among the series H-bridges and regulate the current. T

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Woke, Azunda. "Optimization and Reduction of Losses in 330kv Power Systems for Efficient and Optimal Operation." International Journal for Research in Applied Science and Engineering Technology 11, no. 3 (2023): 282–93. http://dx.doi.org/10.22214/ijraset.2023.49163.

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Abstract: This study was undertaken to mitigate against the loss of electrical power in transformers within the 330kv transmission system in Nigeria using Fuzzy logic technique. The objectives included to utilise Newton-Raphson’s technique to perform a load flow analysis to determine line losses, bus voltages, and load angles, and to use a Fuzzy Inference System to determine the points suitable for capacitor placement in order to reduce reactive power losses on the process and increase voltage profile, thereby improving the power system's stability and efficiency. Using the MATLAB toolbox, New

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Senyuk, Mihail, Murodbek Safaraliev, Aminjon Gulakhmadov, and Javod Ahyoev. "Application of the Conditional Optimization Method for the Synthesis of the Law of Emergency Control of a Synchronous Generator Steam Turbine Operating in a Complex-Closed Configuration Power System." Mathematics 10, no. 21 (2022): 3979. http://dx.doi.org/10.3390/math10213979.

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Stochastic renewable sources of energy have been causing changes in the structure and operation of power systems. High penetration of this type of generation results in decreased inertia of a power system, increased active power fluctuations, and a higher probability of false tripping of emergency control devices. Traditional algorithms of emergency control are not adaptable and flexible enough for systems with high penetration of renewables and flexible alternating current transmission systems. Integration and development of phasor measurement units make it possible to create adaptable emerge

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Thirumalesh, Sunkara, D. Umendra, and Dr P. Sankar Babu. "Design and Control of Series Resonant DC-DC Converter for DC Wind Turbines." Journal of Energy Engineering and Thermodynamics, no. 31 (December 3, 2022): 1–9. http://dx.doi.org/10.55529/jeet.31.1.9.

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High power reliability and high energy density are always in demand, and this is driving the evolution of power conversion technologies. People have begun to examine the potential positions of dc systems in both current and future power equipment due to the rise in the use of renewable energy and the implementation of energy storage in recent decades. Because of its efficiency and power density, dc voltage representation has found use in a wide range of fields, including data centres, the aerospace industry, and dc micro-grids. Resonant DC-DC converters, with their gentle switching and minimal

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Thirumalesh, Sunkara, D. Umendra, and Dr P. Sankar Babu. "Design and Control of Series Resonant DC-DC Converter for DC Wind Turbines." Journal of Energy Engineering and Thermodynamics, no. 31 (December 3, 2022): 1–9. http://dx.doi.org/10.55529/jeet31.1.9.

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High power reliability and high energy density are always in demand, and this is driving the evolution of power conversion technologies. People have begun to examine the potential positions of dc systems in both current and future power equipment due to the rise in the use of renewable energy and the implementation of energy storage in recent decades. Because of its efficiency and power density, dc voltage representation has found use in a wide range of fields, including data centres, the aerospace industry, and dc micro-grids. Resonant DC-DC converters, with their gentle switching and minimal

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41

Rivas, Carlos E., Gilson D. Malo, Luis I. Minchala, and Oliver Probst. "Self-Optimizing Control System to Maximize Power Extraction and Minimize Loads on the Blades of a Wind Turbine." Machines 11, no. 6 (2023): 601. http://dx.doi.org/10.3390/machines11060601.

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This research proposes a methodology for designing and testing a self-optimizing control (SOC) algorithm applied to a wind energy conversion system (WECS). The SOC maximizes WECS power output and reduces the mechanical stress of the wind turbine (WT) blades by optimizing a multiobjective cost function. The cost function computation uses a combined blade element momentum (BEM) and thin-wall beam (TWB) model for calculating wind the turbine power output and blades’ stress. The SOC deployment implies a low computational cost due to an optimization space reduction via a matrix projection applied t

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Grishchenko, Sergey, Konstantin Rymarenko, Marat Nukhaev, Galymzhan Aitkaliyev, Vasilii Kabanov, and Daniil Minin. "AUTOMATION SYSTEM FOR IMPROVING THE EFFICIENCY OF PRODUCTION FOR GAS LIFT WELLS." Interexpo GEO-Siberia 2, no. 1 (2019): 42–48. http://dx.doi.org/10.33764/2618-981x-2019-2-1-42-48.

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The paper deals with the problem of automation of one of the methods of mechanized production - gas lift wells operation. The main advantages of this method of operation are its low cost, work with high gas content, simplicity of the design of deep equipment, fast repair in cattle, minimal power consumption and control and automation of the extraction process at the expense of the Gazlift process control system. This complex is designed to control the process of gas-lift oil production by remote control, as well as the collection and processing of information from primary transducers, the abil

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Zhao, Zhe, and Xiao Yu Li. "Study of Sequential Minimal Optimization Algorithm Type and Kernel Function Selection for Short-Term Load Forecasting." Applied Mechanics and Materials 329 (June 2013): 472–77. http://dx.doi.org/10.4028/www.scientific.net/amm.329.472.

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Short-term load forecasting is important for power system operation,including preparing plans for generation and supply, arranging the generator to set start or stop, coordinating thermal power units and hydropower units. Support vector machines have advantage in approximating any nonlinear function with arbitrary precision and modeling by studying history data. Based on SVM, this paper selects the sequential minimal optimization (SMO) algorithm to compute load forecasting, because SMO can avoid iterative, so as to short the running time. If we select different kernel functions and the SMO typ

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Mestnikov, N. P., P. F. Vasilyev, G. I. Davydov, A. M. Khoyutanov, A. M. N. Alzakkar, and A. A. Lobashev. "Investigating the effects of ambient temperature on photoelectric unit operation." iPolytech Journal 27, no. 1 (2023): 134–46. http://dx.doi.org/10.21285/1814-3520-2023-1-134-146.

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In this paper, effects of low and high ambient temperatures on the operation of a photoelectric unit are investigated. The research methodology consisted in determination of the energy efficiency of a photoelectric unit across a wide range of ambient temperatures, providing graphical interpretations and describing the procedure of field observations. Regularities in determining the average statistical indicators of energy efficiency rise and drop in a photoelectric unit were applied for a particular range of ambient temperatures. These studies were undertaken during the winter of 2021 in the M

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Burzler, J. M., S. A. Amelkin, A. M. Tsirlin, and K. H. Hoffmann. "Optimal Allocation of Heat Exchanger Investment." Open Systems & Information Dynamics 11, no. 03 (2004): 291–306. http://dx.doi.org/10.1023/b:opsy.0000047572.63034.66.

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The optimal allocation of a given investment capital to the heat exchanging inventory is studied for heat engines, refrigerators and heat pumps. The study is based on an endoreversible model operating between two constant temperature heat reservoirs at optimal thermodynamic performance, which is either minimal entropy production or maximum power production. The analysis accounts for the fact that the actual costs of heat exchangers equipment is subject to the material, design and operating conditions of the heat exchangers so that the dependence between the costs and heat transfer coefficients

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Trotsenko, A. V. "ANALYSIS OF ENERGY CONSUMPTION ECONOMY IN CRYOGENIC SYSTEMS BY THE USE OF HEAT EXCHANGERS." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 60, no. 3 (2017): 256–64. http://dx.doi.org/10.21122/1029-7448-2017-60-3-256-264.

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Evaluation of energy consumption economy due to implementation of the principle of cold regeneration is a formidable problem of exergy analysis of cryogenic systems. A method or evaluation of power consumption economy due to the presence of heat exchangers in the scheme of cryogenic plant is suggested in the present article. The calculations of the economy for the refrigeration and liquefaction regimes of cryogenic nitrogen plant operating in accordance with a simple throttle cycle have been carried out. The approximate method for evaluation of power consumption economy demonstrated that for a

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Garrido, Izaskun, Aitor J. Garrido, Jesús A. Romero, Edorta Carrascal, Goretti Sevillano-Berasategui, and Oscar Barambones. "Low EffortLiNuclear Fusion Plasma Control Using Model Predictive Control Laws." Mathematical Problems in Engineering 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/527420.

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One of the main problems of fusion energy is to achieve longer pulse duration by avoiding the premature reaction decay due to plasma instabilities. The control of the plasma inductance arises as an essential tool for the successful operation of tokamak fusion reactors in order to overcome stability issues as well as the new challenges specific to advanced scenarios operation. In this sense, given that advanced tokamaks will suffer from limited power available from noninductive current drive actuators, the transformer primary coil could assist in reducing the power requirements of the noninduct

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Nathasri, Winai, Witsaroot Witoontorn, and Surachai Chaitusaney. "Substation Expansion Considering Reliability of Various Bus Configurations and Load Growth." Applied Mechanics and Materials 781 (August 2015): 258–61. http://dx.doi.org/10.4028/www.scientific.net/amm.781.258.

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This paper proposes a method for electrical substation expansion by considering reliability indices of various types of bus configuration in electrical substation. The reliability indices LOLF, LOLP, and EENS are evaluated by using Newton-Raphson power flow calculation with minimal cut sets. The yearly load growth, together with power capacity of components (capacity limit of components), and the operation of protective components are also taken into account. Two types of failures, i.e. active failure and passive failure, are considered. Finally, the reliability of all bus configuration types

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Zhang, Xin Yin, Zai Jun Wu, Si Peng Hao, and Ke Xu. "A Study on the New Grid Integration Solutions of Offshore Wind Farms." Advanced Materials Research 383-390 (November 2011): 3610–16. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3610.

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Offshore wind farm is developed in the ascendant currently. The reliable operation, power loss, investment cost and performance of wind farms were effect by the integration solutions of electrical interconnection system directly. Several new integration configurations based on VSC-HVDC were comparative analyzed. For the new HVDC topology applied the wind farm internal DC bus, the Variable Speed DC (VSDC) system that is suitable for those topologies was proposed. The structure of VSDC was discussed and maximum wind power tracking was simulated on the minimal system. It is clear that new integra

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Tikhonov, Pavel V. "Energy-Saving Led Lighting System With Parallel Power Supply By Photovoltaic Modules And By Network." Volume 28, Number 6, 2020, no. 03-2020 (December 2020): 36–40. http://dx.doi.org/10.33383/2019-082.

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The current state of LED lighting systems with parallel power supply by photovoltaic modules and central power supply network is analysed. The approach to implementation of parallel operation of LED luminaire powered by two sources of power is presented. It is simple, cheap and highly reliable as compared to the existing solutions. Based on this approach, four diagrams are developed which are applicable correspondingly to lighting applications and characteristics of photovoltaic modules and power consumers. The first and the second diagrams contain minimal quantity of transformers, but a numbe

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